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Dayr al Aswad
Basic information Name: Dayr al Aswad
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2019
Country: Egypt
Mass:help 1200 g
Classification
  history:
Recommended:  R5    [explanation]

This is 1 of 39 approved meteorites classified as R5.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 11 Nov 2021
Writeuphelp
Writeup from MB 110:

Dayr al Aswad        30°46’10.79’’N, 28°06’30.7’’E

Marsa Matruh, Egypt

Find: 2019 Aug 01

Classification: Rumuruti chondrite (R5)

History: The meteorite was found by Mr. Amr Khaled in August 2019 during a field trip to the North Western Egyptian desert.

Physical characteristics: Ten several cm sized dark brownish fragments lacking fusion crust were recovered.

Petrography: The meteorite displays a brownish unbrecciated interior composed of well-formed porphyritic and barred chondrules (mean diameter about 400 µm) set in a fine grained matrix dominated by ferroan olivine. More minor phases include low-Ca pyroxene, Ca-pyroxene, sodic plagioclase, pentlandite, and low-Ti chromite; no metal has been detected. Olivine and pyroxene are compositionally equilibrated.

Geochemistry: olivine: Fa37.8±0.4 (Fa37.3-38.4, n=12); low-Ca pyroxene: Fs29.4±0.6Wo1.5±0.1 (Fs28.4-30.1Wo1.4-1.6, n=8); Ca-pyroxene: Fs9.9±0.4Wo46.6±0.6 (Fs9.4-10.3Wo45.7-47.6, n=8); feldspar: An13.1-14.7Ab81.0-83.2Or3.5-4.2, n=3

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Marsa Matruh
Date:2019 Aug 01
Latitude:30°46'10.79''N
Longitude:28°06'30.7''E
Mass (g):1200
Pieces:10
Class:R5
Shock stage:S1
Weathering grade:moderate
Fayalite (mol%):37.8
Ferrosilite (mol%):29.4; 9.9
Wollastonite (mol%):1.5; 46.6
Magnetic suscept.:2.94
Classifier:A. Greshake, MNB
Type spec mass (g):37.6
Type spec location:MNB
Main mass:Amr Khaled
Finder:Amr Khaled
Comments:Submitted by Ansgar Greshake
Institutions
   and collections		 MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography:

Egypt
Coordinates:
     Recommended::   (30° 46' 11"N, 28° 6' 31"E)

Statistics:
     This is 1 of 13 approved meteorites from Marsa Matruh, Egypt
     This is 1 of 127 approved meteorites from Egypt (plus 12 unapproved names) (plus 1 impact crater)
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Synonymshelp: Dayr al Aswad 001 (First meteorite in DCA)

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